Gun sight mount



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s. T. M|TH GUN SIGHT MOUNT Filed April 21, 1936 2 Sheets-Sheet 1 INVENTOR. 6M

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GUN SIGHT MOUNT Fi',.ed April 21, 1936 2 Sheets-Sheet 2 INVENTOR.

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ATTORNEY.

33. litulvit I HIUAL INC) I HUWILN is.

Patented May 17, 1938 UNITED STATES OEEHLN IRUUHB PATENT OFFICE GUN SIGHT MOUNT Skardon T. Smith, Detroit; Mich.

Application April 21, 1936, Serial No. 75,545

6 Claims.

The object of my invention is to produce a detachable gun sight mount adapted for installation on any gun barrel or receiving case designed for retaining special sight units therein.

Another object is to produce a detachable gun sight mount adapted for mounting telescope sight units on a gun barrel or casing, and provided with suitable means for making both elevation and wind adjustments thereof, and in either direction.

A further object is to produce. a special sight mount for any gun, adaptable for receiving therein interchangeable sight units, either of the telescope or fixed frame type, and without disturbing previously acquired adjustments for the respective sights.

A still further object is to produce a gun sight mount provided with micrometer wind adjustment means so calibrated as to re-set the respective sight unit for any chosen off-set by predetermined micigi wpazgngs.

Another objec is to pro uce a gun sight mount that is simple in construction, easily installed on any type of gun, efliciently operated and that can be manufactured at a very low cost.

These several objects are attained in the preferred form by the construction and arrangement of parts more fully hereinafter set forth.

Similar parts on all drawings are marked by similar numerals or letters.

Fig. 1 is a side view of my detachable gun mount attached to a gun barrel receiving case, showing the general arrangement of assembled parts and with a special telescope sight unit mounted therein.

Fig. 2 is a top view of the sight mount and inclosed telescope unit and means for clamping same tightly therein.

Fig. 3 is a vertical sectional view lengthwise of the mounts, with the telescope sight unit indicated in dotted lines, taken on the line 3-3 of Fig. 2, showing the screw adjustment means and mount attaching plate.

Fig. 4 is a cross-sectional view taken on the line 4-4 of Fig. 1, showing the relative position of the various parts and the anchor means for retaining the respective mounts in position.

Fig. 5 is another cross-sectional view taken on the line 55 of Fig. 1 showing the adjustable mount and means for both vertical and lateral adjustment of the inclosed sight unit.

Fig. 6 is also a cross-sectional view as taken on the line 44 of Fig. 1 showing the same mount base but with an interchangeable fixed sight unit mounted therein.

Fig. 7 shows a side view of a double adjustment mount base for interchangeable sight units.

Figs. 8, 9 and 10 illustrate a modified form of single mount base frames, and provided with either single or double adjusting screw units.

Fig. 11 is a side view of a rigid peep sight unit as may be substituted in the mount base in place of the special telescope unit shown in Figs. 1 and 2, and is to be used with the double adjustment mount base shown in the Fig. 7.

Fig. 12 shows a modified end view of the sight mounts 8 and 9.

In general, my device comprises a flanged and grooved base section suitable for fixedly attaching to a gun barrel or receiving case, and provided with two sight mount frames for chosen sight units, adjustably mounted within the flanged base grooves, and positioned in parallel alignment with the axis of the supporting gun barrel. The base groove flanges are provided with suitable adjusting screws and micrometer adjusting means designed for securing any de sired adjustment, either for elevation or for wind adjustment, the said adjusting screws also provide means for securely clamping the mounts within the base grooves.

I will now describe more fully the detailed construction of my device, referring to the drawings and the marks thereon.

The mount base may be made in either the single or double type, also provided with either single or double screw adjustment means. However, the preferred structure is illustrated in Figs. 1 to 7 inclusively, and is confined to the double base type which is more specifically described herein, and with the remaining figures as modifications thereof.

The double base I as illustrated in Figs. 1 to 7, is preferably made of steel, machined and hardened, and comprises a side attaching plate a formed with arm frames 17 across the top edge at opposite plate ends positioned at one side of the plate and approximately at right angles thereto. The side plate a is preferablyslightly curved and formed with a longitudinal relief slot 0 along the inner surface lengthwise thereof, for securing a more stable bearing against the supporting surface to which it may be attached. Screw holes d are provided through the side plate walls for rigidly mounting the base I on the gun support member. The cross-arm frames b are formed with triangular shaped slide grooves e positioned therein in alignment with the gun barrel center line, each arm being provided with a threaded screw hole I through the groove bottom wall positioned on the groove center line. Within one of these threaded holes 7 is mounted an elevation adjustment screw 2 securely held therein by the lock nut 3 mounted thereon for varying the elevation of one telescope end. Also the opposite groove side walls 2 are provided with threaded screw holes 9, positioned therein at right angles to their respective wall surfaces, and carry threaded adjusting screws 4 and 5 mounted therein. A suitable lock nut 6 is mounted on each of the said adjusting screws for locking them in any adjusted position. One of the side adjusting screws, 5 is preferably of a micrometer construction and formed with a cylindrical head section having parallel milled graduations h formed around the circumference thereof, and preferably calibrated to represent some pre-determined olfset desired for the sight unit to be mounted within the base grooves, such as fractions of minutes or degrees of angle for some specific sight length. The end surface of the micrometer screw head preferably being graduated in sixty equal spaces representing minutes or multiple of minutes of a degree, and said end surface bearing the numerals 0 and 30 positioned diametrically thereon, so that the micrometer screw is readable in either directional turn. Fixedly mounted on the base arm frame b, adjacent the micrometer screw 5, is a spring pawl 1, positioned to engage the milled graduations h of the screw 5, for preventing free rotations thereof, and to determine the exact desired screw adjustment required. The pawl end is preferably set to contact the milled graduations on the top side, and is designed to indicate the zero setting point for the sight adjustment in its initial alignment with the gun barrel centerline, when all screws are properly adjusted and tightened. The base I is securely attached to the gun barrel A, or gun receiving case B, in its pre-determined position, by means of suitable screws l2, said base being positioned thereon with the groove centerline parallel with the gun barrel.

Within the base triangular slide grooves e are placed special sight mounts 8 and 9. When these mounts are applied to the telescope type of sight as indicated in Figs. 1 to 5, they are preferably made in separate units as illustrated, also of steel, machined and hardened. Each mount is formed with a triangular base section 70 having an extended circular spring attaching ring clamp m at the vertex. The top side of the attaching ring section is also extended forming separated arm ends, and is provided with suitable clamping screws l0 mounted therethrough. The triangular base section 74: is formed with a recess n lengthwise thereof, providing a two point frame support. One of the sight mounts, 8 is also provided with a stop arm p projected below the triangular base k, designed to engage the base frame arm b for preventing slippage of the mounts therein when subjected to the recoil of the gun upon discharge.

When the mounts 8 and 9 are properly and securely attached to the telescope sight unit C by means of their respective clamp screws l0, as shown in Figs. 1 and 2, the assembled unit may easily be inserted within the triangular slide grooves e of the base I, from the rear, and until the stop projection 12 of the mount 8 engages its respective base arm b. This positions the sight unit within the base with one sight mount resting on the elevation adjusting screw 2 clear from the base arm b as shown in Fig. 5, and with the other anchor sight mount 9 resting directly on the base arm as shown in the Fig. 4, providing a three point suspension for the assembled sight unit C. The adjusting screws 4 and 5 are then tightened against their respective sight mount walls, securely clamping same therein. The elevation adjusting screw 2 may be mounted in either front or rear base arm holes f, as desired.

The proper initial sight adjustment should be made with all adjusting screws 2, 4 and 5, and continued until the sight unit C is in its true alignment with the supporting gun barrel, for the micrometer screw setting at zero. All subsequent adjustments for wind or elevation may be easily determined by the micrometer adjusting screw 5. After adjustment is made, all look nuts are tightened on their respective adjusting screws to be disturbed only when readjustment is required, or for removing the sight unit from the base I. The telescope unit C may be easily removed from the base by loosening the adjusting screws 4 on the side opposite the micrometer screw 5, and without disturbing the arranged sight adjustment, and later remounted when desired.

When more than one type of sight unit is to be used on the same gun or base, either of the telescope, or fixed peep sight type, C or D respectively,

the base la may be slightly lengthened at one end providing one longer cross arm ha and which is provided with a double set of adjusting and micrometer screws 4 and 5, as illustrated in Figs.

6 and '7. The remaining base construction is micrometer screws 4 and 5 in the long base arm end, arranged with a different pair for each type of gun sight units to be used therein. The sight units are then interchangeable in the base la without disturbing their respective prior sight adjustments.

A short fixed peep sight unit D is illustrated in the Fig. 7, and an elongated sight unit structure is shown in Fig. 11 of the drawings. In each case the bar body 1' is made integral with the sight mount bases is, preferably assembled as one unit, and are intended to illustrate the application of any sight unit provided with attached flanged mount bases.

A modified form of base is illustrated in Figs. 8, 9 and 10, and are of the single or separated structure. .The triangular grooved cross-arm structure bb is the same as described for the base I but is provided with double curved side plates aa, one on either side thereof. The base section is provided with attaching screw holes dd in the upper walls, instead of the side plates as previously shown. Each base section is also provided with threaded adjusting screw holes 1 and g as in the former case, but the separated base sections may be mounted on the gun barrel, or receiver case, in any desired longitudinal positions, and may be better adapted to longer telescope sight units C, or gun barrels having side projections thereon. These separated base sections may be made for a single pair of adjusting and micrometer screws 4 and 5 as illustrated in Fig. 9, or with the double pair of screws as shown in Fig. 10, similarly as in the former cases. The cross-section is the same in either case as illustrated in Fig. 8. The operation and application are exactly the same as in the previously described structure for Figs. 1 to 7.

It is apparent that my device is subject to various modifications in both design and arrangement of parts, without departing from the spirit of my invention, and I therefore claim not only the actual structure disclosed, but any modification thereof that is substantially a substitution of parts herein shown and described.

Having fully described my gun sight mount, what I claim as my invention and desire to secure by Letters Patent is: I

1. A gun sight unit adapted for mounting a detachable sight unit on a gun barrel and used therewith, comprising two separated base frames provided with suitable means for fixedly attaching same to the gun barrel in alignment with each other along said barrel, said base frames being formed with undercut triangular grooves lengthwise thereof parallel with the supporting gun barrel center line, each of said base frames being provided with a pair of threadably mounted adjusting screws oppositely positioned in their respective groove side walls perpendicular thereto, one of said adjusting screws having a graduated head, one of said base frames being provided with an elevation adjusting screw threadably mounted in the groove bottom on the center line thereof normal to the barrel centerline, sight mounts formed with triangular base sections each adjustably mounted within a respective one of said base grooves and positioned therein to be engaged and laterally shifted by their respective adjusting screws, and a suitable sight unit fixed to said mount.

2. A sight mount for guns comprising a base elongated longitudinally of the barrel, opposed upstanding inwardly-inclined flanges on said base forming at each end thereof an undercut groove, a sight unit including two rigidly connected triangular base sections each shaped to loosely fit in a respective groove, and means extending through each flange perpendicular thereto for engaging and laterally adjusting each base section cut groove, a sight unit including two rigidly connected triangular base sections each shaped to wwui wit posed upstanding inwardly-inclined flanges on\ said base forming at each end thereof an under- A cut groove, a suitable sight unit including two to rigidly connected triangular base sections each shaped to loosely fit in a respective groove, a vertical sight adjusting screw mounted in the base between the flanges at one end thereof, and adjusting screw means mounted through each flange i5 perpendicular thereto for engaging and laterally/ adjusting each base section and securing same/in position on said base.

5. A sight mount for guns comprising a base elongated longitudinally of the gun barrel, op- 2 posed upstanding inwardly-inclined flanges on said base forming at each end thereof an undercut groove, a sight unit including two rigidly connected triangular base sections each shaped to loosely fit in a respective groove, one of said tri- 25 angular base sections being formed with a recoil stop arm positioned to engage the mount base wall, elevation sight adjusting means mounted in one base end between the inclined flanges, and

means extending through each flange perpen- 30 dicular thereto for engaging and laterally adjusting each base section and securing the same in position on the base.

6. A telescope sight mount for guns comprising a base elongated longitudinally of the gun 35 barrel, opposed upstanding inwardly-inclined flanges on said base forming at each end thereof an undercut groove, a telescope sight unit including two rigidly connected triangular base sections each shaped to loosely fit in a respective in groove, one of said triangular base sections being formed with a recoil stop arm positioned to engage the mount base wall, an elevation sight adjusting screw mounted in one base end between the inclined flanges, and an adjusting screw mounted through each flange perpendicular thereto for engaging and laterally adjusting each base section and securing the same on said base, one of said adjusting screws having a graduat d SKARDON T. SMITH. 

